Aneurysmal subarachnoid hemorrhage: Treatment and prognosis - UpToDate: "Grading severity of SAH — The degree of neurologic impairment and the extent of subarachnoid bleeding at the time of admission are the most important predictors of neurologic complications and outcome [1,3]. Therefore, it is imperative to grade the severity of SAH as soon as feasible after presentation and stabilization of patients with SAH."